Hydraulic boring apparatus.



No. 704,385A Patented Iuly 8, |902.

G. SCHMIDT.

HYDRAULIC BORING APPARATUS.

(Application led May 17, 1902.

(No Model.)

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UNiTED STATES PATENT OFFICE.

GEORG SCHMIDT, OF CHARLOTTENBURG, GERMANY.

HYDRAULIC BORING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 704,385, dated J' uly 8, 1902.

Application flied May 17,1902;

To all whom, it' may concern.-

Be it known that l, GEORG SCHMIDT, a subject of the Duke of Brunswick, residing at and whose post-office address is No. 160 Kantstrasse, Charlottenburg, near Berlin, Kingdom of Prussia, German Empire, have invented certain new and useful Improvements in orRelatingtoI-lydraulicBoringApparatus, of which the following is a specification.

The present invention relates to improvement-s in beamless hydraulic boring apparatus; andit consists in elastically suspending the piping connecting the tool to the pump on springs arranged above the bore-hole and in inserting a hydraulic check-valve between the piping and the tool. Owing to the friction ot' the circulating water in the piping,the latter, and consequently the tool, is moved downwardly to a certain extent, compressing the springs until by the action of the hydraulic check-valve a shook is exerted upon' the tool by the momentum ofithe water. On

bringing the water to rest, and consequently.;

removing the friction, the tool and the piping are raised by the rebound of the tool and by the resilient expansion of the springs. operation then begins again.

In the accompanying drawings, Figure 1 is an elevation, partly in section, of a hydraulic boring-tool constructed in accordance with the present invention. Figs. 2, 3, and -t are cross-sections of the hydraulic check-valve on the lines 2 2, 3 3, and 4 4 of Fig. 1, respectively; and Fig. is a modied construction of the hydraulic check-valve.

Like characters indicate like parts throughout the drawings.

The piping a, to which the circulating Water is supplied by a pump through a hose with a water-distributing head, is mounted upon a frame (l by means of a clamp?) and of a ballbearing c, so as to allow the pipe to turn and to move with the frame CZ. rThe lower part e of the frame carrying the springs f is stationary.

In some cases it may be advisable to employ a beam in order to allow the boring device to be operated, if necessary, according to the Canadian system or according to the old water-circulating system, and in such a case the piping may be also attached to one The ,seria No. 107,758. (No man I end of the beam. The otherarm of the latter is then made stationary, and the springs are preferably arranged at the fulcrum of the beam.

In order to prevent the springsf from working into the frame e d, the latter are lined on the sides in contact with the springs with sheet metal. For the purpose of safely guiding the upper part d of the frame the lower part e thereof is provided with guide-rods m. The number of the springs f can be increased or reduced, as desired; but their number and their effect should be so calculated as to allow the upper part d of the frame to yield to the extent of some centimeters under the inl-luence of the shock of the water.

The hydraulic Valve inserted between the piping and the tool and adapted to automatically check the circulating water at a certain speed of the latter and produce the shock Awhich actuates the boring-tool consists of a vweighted or springt-actuated valve. In the construction shown in Fig. 1 the valve inserted between the piping a and the tool 'n consists of a center 'pieceh and two sockets g t', which are attached to the piping and to the tool and are connected with the center piece h by suitable `screwed rings o. The center pieces Iz andthe sockets are provided with five longitudinal passages 10, 11, 7, 12, and 13, Figs. 1 and 3, which are so connected with the transverse openings 2, 3, 6, and 8 in the sockets and with two openings 4c and 5 that the water coming from the passage 1 of the piping a flows through the opening 2 into the front and rear passages and 11, Figs. 1 and 2. From these the water liows through the transverse opening 3 and the opening 4 vinto the central chamber 13 below the piston l, which piston is freely movable in this chamber, Figs. 1 and 3. The water afterward flows through the opening 5 and the transverse opening 6 into the lateral longitudinal passages 7 and 12 and thence through the passage 8 and opening 9 into the interior of the tool 77.. The hollow portion of the tool branches into two, so that the water leaves the tool on both sides at above the cutting edge. The weight of the piston Z, owing to its length, corresponds to the spring action in a spring-actuated valve. This piston can IOC be hollowed and lled with lead, in which case its length would be reduced without, however', reducing the weight of the piston. The operation of the boring device described is as follows: The water on flowing through the valve and through the different passages of the valve raises the pistonZ when the speed attains a certain value. The passage 5 is then closed by the ball-shaped end of the piston Z, thus checking the circulation ofthe water. The whole of the water contained in the piping consequently comes to a sudden stop and transmits its downward momentum to the piping and to the tool, which thereby receives a blow in the downward direction, which results in the boring action. Owing to the rigid connection of the tool with the piping, the latter is bodily moved in a downward direction and the springs f are still more compressed than they were by the slight depression of the piping caused by the friction of the water. As soon as the water has come to rest the springs f expand, thereby raising the piping, and, owing to the valve being reopened, the operation can begin again. An air vessel with a gage can be inserted between the pump and the piping and provided with a device for renewing the air.

In the construction shown in Fig. 5 the checking of the dow of water is eected by a spring-actuated valve q, which conveniently is a hemispherical valve. The projection 1', on which the Valve normally rests when open, serves also as a guide for the valve-spindle s, which is provided with a spring t. When the velocity of the water flowing through the Valve attains a certain point, the valve q is moved down into its seat against the action of the spring t, thereby closing the passage for the circulating water, and thus edecting the same operation as the construction above described. The frequency of the stroke of the tool and the velocity of the water necessary to operate the valve can be controlled by the adjustment of the spring t.

What I claim, and desire to secure by Let ters Patent of the United States, is-

l. In a hydraulic boring apparatus, the com bination with the boring-tool of a pipingsuspended on springs and a check-valve between the piping and the tool for automatically checking the circulating water at a certain speed of the latter, substantially as and for the purpose described.

2. In ahydraulic boring apparatus, the combination with the boring-tool of a piping suspended on springs and a check-valve between ihe piping and the tool, the check-valve coinprising a valve-chamber with an inlet and outlet opening and a weighted or spring-actuated valve for closing the outlet-opening of the valve-chamber at a certain speed of the circulating water, substantially as and for the purpose described.

3. In ahydraulic boring apparatus, the combination with the boring-tool of a piping suspended on springs and a check-valve between the piping and the tool, the checkvalve com prising a valve-chamber with an inlet and ontlet opening, a valve-spring the tension of which is capable of being adjusted, substantially as and for the purpose described.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

GEORG SCHMIDT.

lVitnesses:

WOLDEMAR HAUPT, HENRY HAsPER. 

